My 8yr old kid hitting a 10' double on 16" BMX bike

Grom jump. My buddy just built this floater that's 13' to the table and 18' to the tranny so we could train some younger riders how to jump. Watched on 20yr old wad up on it. Then my kid pushes up and says I want to try it. After casing it hard twice, he just barely gets this one off. I call it a win. He's 8, on a second hand POS 16" kiddie bike.